** Changed in: cloud-init
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1839854
Title:
CloudStack provider cannot determine correct metadata IP with multiple
network interfaces
Status in cloud-init:
Fix Released
Bug description:
[Problem]
When mutliple network interfaces are present in a CloudStack VM, cloud-init
randomly chooses the gateway address to fetch the metadata from. This is not a
problem when all network interfaces offer metadata. However, if a shared
network interface is attached to the VM the gateway on that interface doesn't
have the metadata. Cloud-init will timeout waiting for response from the
gateway and will not apply metadata to the host.
[How to reproduce]
- Create VM with 1x Isolated and 1x Shared Network
- Ensure cloud-init is installed in the VM and CloudStack is configured as a
metadata provider
- Boot VM
[Expected result]
- VM should boot and apply metadata from cloudstack
[Observed result]
- cloud-init sometimes chooses wrong metadata server IP
- cloud-init delays startup waiting for response
- metadata isn't applied
- cloud-init service fails
[Notes]
I noticed that in "cloudinit/sources/DataSourceCloudStack.py"
get_vr_address() the dhcp lease option is preferred over the default gateway.
Wouldn't it be smarter to just always use "get_default_gateway()"?
We used till recently cloud-init 0.7.5 but after the introduction of
NetworkManager lease support we started running into this problem.
(https://github.com/cloud-init/cloud-init/commit/33816e96d8981918f734dab3ee1a967bce85451a#diff-5bc9de2bb7889d66205845400c7cf99bR182)
Up to this point cloud-init has always used the default_gateway method.
CentOS 7 has only recently updated cloud-init in it's repos, so we were stuck
on this old version for a long time.
Maybe it would be nice to have a configuration option to choose between the
methods manually?
Also it would be cool if on a fault cloud-init would choose the next possible
dhcp lease.
[Attachment]
We added some files for debugging as a tar.gz.
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